<?php
$message="";
if(count($_POST)>0) {
    $conn = mysqli_connect("kunet","k1639600","papaya","db_k1639600");
    $result = mysqli_query($conn,"SELECT * FROM user WHERE username='" . $_POST["username"] . "' and password = '". $_POST["password"]."'");
    $count  = mysqli_num_rows($result);
    if($count==0) {
        $message = "Invalid Username or Password!";
    } else {
        $message = "You are successfully authenticated!";
    }
}